*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
.container{
	width: 1200px;
	margin: auto;
}
.ll{
	width: 33.3333%;
	height: 100px;
	float:left;
	
	background: #FF0000;
}
/*响应式代码*/
@media (max-width:600px) {
	.container{
		width: 100%;
	}
	.ll{
		width: 100%;
	}


	
}
.container: after{
	content:"";
	display: table;
	clear: both;
	
}
